<template>
	<div>
<el-breadcrumb separator-class="el-icon-arrow-right">
  <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
  <el-breadcrumb-item>商品管理</el-breadcrumb-item>
  <el-breadcrumb-item>商品分类</el-breadcrumb-item>
</el-breadcrumb>
    <el-card>
      <el-row>
        <el-col :span='2'>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
     </el-row>

	<tree-table 
	:data="catelist" 
	:columns="columns"
	:selection-type="false" 
	:expand-type="false"
	show-index index-text="#"
	border
	:show-row-hover="false"
	>
		<template slot='isok' slot-scope='scope'>
		<i class="el-icon-success" v-if="scope.row.cat_deleted === false" style="color: lightgreen;"></i>
        <i class="el-icon-error" v-else style="color: red;"></i>
		</template>
	
		<!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
          <el-tag type="success" size="mini" v-else-if="scope.row.cat_level===1">二级</el-tag>
          <el-tag type="warning" size="mini" v-else>三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="opt">
          <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
          <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
        </template>

	</tree-table>
		
	<el-pagination 
      @size-change="handleSizeChange"
       @current-change="handleCurrentChange" 
       :current-page="querInfo.pagenum"
        :page-sizes="[3, 5, 10, 15]" :page-size="querInfo.pagesize" layout="total, sizes, prev, pager, next, jumper" :total="total">
      </el-pagination>	
    </el-card>

	    <!-- 添加分类的对话框 -->
    <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClosed">
      <!-- 添加分类的表单 -->
      <el-form 
      :model="addCateForm"
       :rules="addCateFormRules"
        ref="addCateFormRef"
         label-width="100px">
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类：">
          <!-- options 用来指定数据源 -->
          <!-- props 用来指定配置对象 -->
          <el-cascader expand-trigger="hover" :options="parentCateList" :props="cascaderProps" v-model="selectedKeys" @change="parentCateChanged" clearable change-on-select>
          </el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>

	</div>
</template>

<script>
	export default {
		data () {
			return {
				querInfo: {
					type: 3,
					pagenum: 1,
					pagesize: 5
				},
				catelist: [],
				total: 0,
				columns: [
					{
						label: '分类名称',
						prop: 'cat_name'
					},
					{
						label: '是否有效',
						type: 'template',
						template: 'isok'
					},
			        {
			          label: '排序',
			          // 表示，将当前列定义为模板列
			          type: 'template',
			          // 表示当前这一列使用模板名称
			          template: 'order'
			        },
			        {
			          label: '操作',
			          // 表示，将当前列定义为模板列
			          type: 'template',
			          // 表示当前这一列使用模板名称
			          template: 'opt'
			        }
				],
				addCateFormRules: {
			        cat_name: [
			          { required: true, message: '请输入分类名称', trigger: 'blur' }
			        ]
				},
			  addCateForm: {
		        // 将要添加的分类的名称
		        cat_name: '',
		        // 父级分类的Id
		        cat_pid: 0,
		        // 分类的等级，默认要添加的是1级分类
		        cat_level: 0
		      },
		      cascaderProps: {
				        value: 'cat_id',
				        label: 'cat_name',
				        children: 'children'
			},
		      addCateDialogVisible: false,
		      parentCateList: [],
		      selectedKeys: []
			}
		},
		created() {
			this.getCateList()
		},
		methods: {
			async getCateList() {
			const { data: res } = await this.$http.get('categories', {
					params: this.querInfo
				})
			  if (res.meta.status !== 200) {
		        return this.$message.error('获取商品分类失败！')
		      }
			 this.catelist = res.data.result
		      // 为总数据条数赋值
		     this.total = res.data.total
			},
			handleSizeChange (newSize) {
		      this.querInfo.pagesize = newSize
		      this.getCateList()
			},
    // 监听 pagenum 改变
		    handleCurrentChange(newPage) {
		      this.querInfo.pagenum = newPage
		      this.getCateList()
		    },
		    showAddCateDialog () {
		    	this.getParentCateList()
		    	this.addCateDialogVisible = true
		    },
		    async getParentCateList() {
		    	const { data: res } = await this.$http.get('categories', {
		        params: { type: 2 }
		      })
			  if (res.meta.status !== 200) {
		        return this.$message.error('获取父级分类数据失败！')
		      }
		      // console.log(res.data)
		   	 this.parentCateList = res.data
		    },
		    parentCateChanged () {
		    	console.log(this.selectedKeys)
		    	if (this.selectedKeys.length > 0) {
		    		this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
		    		this.addCateForm.cat_level = this.selectedKeys.length
		    		return false
		    	} else {
			        this.addCateForm.cat_pid = 0
			        // 为当前分类的等级赋值
			        this.addCateForm.cat_level = 0
		    	}
		    },
		    addCate () {
		    	this.$refs.addCateFormRef.validate(async valid => {
		    		if (!valid) return false
		    		const { data: res } = await this.$http.post('categories', this.addCateForm)

			        if (res.meta.status !== 201) {
			          return this.$message.error('添加分类失败！')
			        }
				this.$message.success('添加分类成功！')
		        this.getCateList()
		        this.addCateDialogVisible = false
		    	})
		    },
		    // 监听对话框的关闭事件，重置表单数据
		    addCateDialogClosed() {
		      this.$refs.addCateFormRef.resetFields()
		      this.selectedKeys = []
		      this.addCateForm.cat_level = 0
		      this.addCateForm.cat_pid = 0
		    }
		}
	}
</script>

<style lang="less" scoped>
.treeTable {
  margin-top: 15px;
}

.el-cascader {
  width: 100%;
}
</style>
